Safety device for elevators



. 2 Sheets-Sheet 1.

(No Model.)

W. P. RIDDER. SAFETY DEVICE FOR ELEVATORS.

PatentedMay 28, 1895.

@mM/wacom We. am

THE Nnmus PETERS co., Fuor'aurnu, wAsngNm'oN. n. c4

(No Model.) 2 Sheets-Sheet 2.

W. P. KIDDER. SAFETY DEVIGE POP. BLEVATORS.

No. 540,169. Patented May 28, 1895.

rfifnNr union.,

WELLINGTON P. KIDDER, `OF BOSTON, MASSACHUSETTS.

SAFETY DEVICE FOR ELEVATORS.

SPECIFICATION forming' part of Letters Patent No. 540,169, dated May 28,189 5.

Original application tiled August 24. 1893, Serial No. 483,952. Dividedand this application filedNovemher 27, 1893- Serial No.

' 492,140. (No model.)

To @ZZ whom t may concern.-

Be it known that I, WELLINGTON P. KID- DER, a citizen of the UnitedStates, residing at Boston, in the county of Suffolk, and State ofMassachusetts, have invented certain new and useful Improvements inSafety Devices for Elevators, of which the following is a specitication,reference being had therein to the accompanying drawings.

This improvement is a modification of the invention shown and claimed inmy application, Serial No. 483,952,1iled August 24, 1893, (patented.Iuly 3, 1894, No. 522,297,) and is tiled as a division of saidapplication. It is intended to show the combination of a levercontroller with a swinging bar in such a manner that the door is lockedwhen the car is moving and `the lever controller is locked when the dooris open.

To these ends the invention consists in-the construction, arrangement,and combination of parts hereinafter more particularly described andthen definitely claimed.

In the accompanying drawings, Figure l is a vertical section of part ofan elevator with a lever-controller and having the front part of the carremoved, the better to show the parts. Fig. 2 is a horizontal section ofthe same with the well-door closed. Fig. 3 is a similar section with thewell-door open. Fig. 4t is a verf tical section on a larger scale, withparts omitted to more clearly illustrate the parts shown. Fig'. 5 showsa modification which will be further described hereinafter. Figs. 6, 7,and 8 are details which will be more fully explained in the followingdescription.

Referring now to the details of the drawings by letter-A represents thewell ot' the elevator, B the door thereof, and O the car intended to beconnected with the hoisting machinery in the usual manner, but as saidhoisting machinery and the rope connecting the operating lever K withthe device for setting the hoisting machinery in motion forms no part ofmy invention and is of the common and well-known form, I have not shownthe same, it being unnecessary to the full understanding ot' myinvention.

Pivoted to brackets F, fast to the wall of the well, is a bar G, havingat some convenient part (preferably the bottom) an extension g', behindwhich is a spiral spring H, tending to force said bar into the path thedoor travels when it is being opened, or into the path of someattachment thereon. t

Pivoted to a bracket I, attached to the side of the car or to anyconvenient part thereof, is a lever J, something of the shape of what iscalled a bell-crank lever, having a curved armj projecting outside thecar andanother arm inside the car, preferably terminating in a footpiece or treadle j. Instead of the treadle-lever shown in full lines,the lever may have an extension upward inside the car, as shown indotted lines in Fig. 4, to be used as a hand-lever.

Mounted in the car in any suitable way is the ordinary controlling leverK, which is arranged to move in either direction, as shown in dottedlines. At the back of this is a swinging frame N, pivoted to thebrackets O at or near the floor of the car, which :frame has alocking-bar at the top having an offset or recess n opposite the placethe leverKoccu pies when the car is at rest.

Pivoted to the edge of the frameN is atappet P, and at Q is a springwhich normally holds said tappet in a horizontal position, but willallow it to swing to a vertical position, either upward or downward,andthen return to its normal position. On the bar G is a projection g,which is so proportioned that it nearly touches the projecting end ofthe tappet P.

The operation of myimprovementis as follows: When the car is in motion,the bar G is behind the edge of the door, and it cannot then be openedbecause the foot-lever is not in position to operate on the said bar IG,and, moreover, the lever K will prevent the frame N being movedsufficiently to permit bar G to swing away from the edge of the door,but when the car is in the proper position and at rest, the lever willbe vertical, and then,'when the operator presses his foot upon thetreadle J, the bar G will swing out of the path of the door toward thecar, which'causes the projection g on the bar G to act on the tappet Pand push the frame inward, causing the walls of the recess on the frameN to engage with the lever K, thus locking the car stationary. The doorcan now be opened and as long as it is IOO opened, the door keeps thebar G stationary, maintaining the engagement of the frame with the leverK until the door has been closed, when the bar G will be pushed back bythe spring H, thus securing the door and then the frame N Will fall backagainst the side of the car, leaving the lever in a condition to bemoved to start the car.

In case the door should be opened by any extraordinary means at the timethe car is passing the door, (which seems almost impossible with thisarrangement,) the tappet P would come in contact with the projection onthe bar G and if said tappet were tixedly connected to the frame,breakage would result, and for this reason I pivot the tappet to theframe, and provide the spring Q which will securely hold the tappet inits normal horizontal position, but will allow it to yield so as tooccupy a vertical position, and thus pass the projection on the bar Gwithout damage resulting.

I prefer to so arrange the parts that the bar G cannot be operateddirectly by hand, and that it shall always be moved by the lever J,either by the use of the foot on the treadle, or by the hand on thelever shown in dotted lines, for then the door cannot be opened unlessthe car is at rest and in the proper position opposite the door to beopened, but if itV is preferred by others, the entrance to the car maybe made wide enough to allow of theoperator moving the bar G by hand; oran open ing may be made in the side ofthe car to admit of this beingdone, and thus the lever H may be dispensed with.

In some cases I may secure the tappet in its position by a frictiondevice, which will yield andl allow the tappet to swing upward ordownward, as the case may be, in case it should meet with anobstruction. Fig. l shows such a device, in which the tappet is securedto the frameNbyabolthaving a spring Q between its head and the tappet.The latter has a projection which tits into a corresponding recess inthe frame N, and the spring will thus always tend to hold the tappethorizontally, but the spring would yield and allow the tappet to yield,in case it met with an obstruction.

Instead of swinging the bar behind the edge of the door, I may sometimesattach a plate or bar 0c, (see Fig. 5) to the door, and swing the barbehind such plate or bar, and where, in the following claims, I refer toa door I mean to be understood as considering such plate or bar as partof the door.

I consider it important that the pivots, on which the door-lockingl barturns, shall be arranged near the path of the door, for then the doorwould remain fastened even if there were no spring or other means usedto keep said locking-bar in its locking position.

Instead of the major part of the bar G passing into the path of thedoor, as shown in most of the figures of the drawings, I may make aprojecting lug on the rear side of the bar (as indicated in dotted linesin Fig. pass into the path of the door or the plate or bar secured toit. This lug may be made integral with the bar or attached thereto, andI wish to be understood as considering all three of these forms, viz:the bar without the lug, the bar with such lug formed thereon, or a barhaving the lug connected thereto, as equivaient constructions in thefollowing claims.

Vhat l claim as new isl. In an elevator and in combination with the car,the controlling lever thereof, and a sliding door, a locking-bar movableinto the path of the sliding door, a recessed bar adapted to engage withthe controlling-'lever and the locking-bar when the door is open,substantially as described.

2. In an elevator and in combination with the car, the controlling-leverthereof, the door, and a locking bar for said door, a lever locking-barco-acting with the controlling-lever and door locking bar, and providedwith a tappet yieldingly connected thereto, substantially as and for thepurpose set forth.

3. In an elevator and in combination with the car, the controlling-leverthereof, the door, and the locking-bar, a lever locking-bar engagingwith the controlling-lever, and having a tappet pivoted thereto, toengage with the door locking-bar, and a spring for holding the same inthe operative position, substantially as described.

In testimony whereof I affix my signature, in presence of two witnesses,this th day of November, 1893.

WELLINGTON P. KIDDER.

Witnesses:

ALBERT W. BROWN, J oHN F. NELSON.

IOD

